Power Control

Power Control Feature Parameter Description

Copyright © Huawei Technologies Co., Ltd. 2010. All rights reserved.

No part of this document may be reproduced or transmitted in any form or by any means without prior written consent of Huawei Technologies Co., Ltd.

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and other Huawei trademarks are trademarks of Huawei Technologies Co., Ltd.

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The information in this document is subject to change without notice. Every effort has been made in the preparation of this document to ensure accuracy of the contents, but all statements, information, and recommendations in this document do not constitute the warranty of any kind, express or implied.

Issue 02 (2009-09-30) Huawei Proprietary and Confidential

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BSS Power Control Contents

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Contents 1 Introduction to This Document .............................................................................................1-1

1.1 Scope ............................................................................................................................................ 1-1 1.2 Intended Audience ........................................................................................................................ 1-1 1.3 Change History.............................................................................................................................. 1-1

2 Overview .....................................................................................................................................2-1

3 Technical Description ..............................................................................................................3-1 3.1 Principles....................................................................................................................................... 3-1

3.1.1 Measurement of Receive Level and Receive Quality .......................................................... 3-2 3.1.2 Power Control Algorithms..................................................................................................... 3-3 3.1.3 Power Control Procedure ..................................................................................................... 3-3

3.2 Huawei II Power Control Algorithm ............................................................................................... 3-4 3.3 Huawei III Power Control Algorithm .............................................................................................. 3-8 3.4 Optimized Huawei III Power Control Algorithm............................................................................. 3-1 3.5 Functions Related to Power Control ............................................................................................. 3-1

3.5.1 Active Power Control ............................................................................................................ 3-1 3.5.2 SAIC Power Control Optimization ........................................................................................ 3-1

4 Parameters .................................................................................................................................4-1

5 Counters......................................................................................................................................5-1

6 Glossary ......................................................................................................................................6-1

7 Reference Documents .............................................................................................................7-1

BSS Power Control 1 Introduction to This Document


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1 Introduction to This Document 1.1 Scope This document describes the functions of and technologies regarding the power control feature of Huawei GBSS, including Huawei II power control algorithm, Huawei III power control algorithm, Single Antenna Interference Cancellation (SAIC) power control optimization, and active power control.

1.2 Intended Audience It is assumed that users of this document are familiar with GSM basics and have a working knowledge of GSM telecommunication.

This document is intended for:

Personnel working on Huawei GSM products or systems System operators who need a general understanding of this feature

1.3 Change History The change history provides information on the changes in different document versions.

There are two types of changes, which are defined as follows:

Feature change Feature change refers to the change in the Power Control feature of a specific product version.

Editorial change Editorial change refers to the change in wording or the addition of the information that was not described in the earlier version.

Document Issues The document issues are as follows:

03 (2010-02-10) 02 (2009-09-30) 01 (2009-06-30)

03 (2010-02-10) This is the third commercial release of GBSS9.0.

Compared with issue 02 (2009-09-30) of GBSS9.0, issue 03 (2010-02-10) of GBSS9.0 incorporates the changes described in the following table.

1 Introduction to This Document BSS

Power Control

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Change Type Change Description Parameter Change

Feature change

The description of optimized Huawei III power control algorithm is added.

The added parameters are listed as follows: Power Control Switch III Power Control Optimized Enable III UL Filter Adjust Factor III DL Filter Adjust Factor III UL RexLev Protect Factor III DL RexLev Protect Factor III UL RexQual Protect Factor III DL RexQual Protect Factor

02(2009-09-30) This is the second commercial release of GBSS9.0.

Compared with issue 01 (2009-06-30) of GBSS9.0, issue 02 (2009-12-20) of GBSS9.0 incorporates the changes described in the following table.

Change Type Change Description Parameter Change

Feature change None. None.

Editorial change The structure of the document is optimized. None.

01(2009-06-30) This is the first commercial release of GBSS9.0.

Compared with issue 01 (2009-04-30) of GBSS8.1, issue 01 (2009-06-30) of GBSS9.0 has no change.

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2 Overview Power Control is used to control the transmit power of the MS and BTS during a connection. The desired QoS, however, must be ensured when the transmit power is decreased.

The benefits of Power Control are as follows:

Decrease in interference After Power Control is enabled, signals received by the MS and BTS remains stable without compromising the signal quality, adjacent channel interference is reduced, and C/I is increased.

Decrease in power consumption When the transit power of the MS and BTS decreases, the maximum standby and speech time of the MS will increase, and less electrical power will be required by the BTS. If the BTS is powered by storage batteries, frequent recharging is not required.

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3 Technical Description 3.1 Principles Power Control aims to improve the QoS over the Um interface. After Power Control is enabled, the transmit power of the MS and BTS is adjusted according to the comprehensive decision made by the BSS. The decision on power adjustment is made on the basis of the specified thresholds, receive level and receive quality on uplink and downlink reported by the BTS. The principles of Power Control are as follows:

Transmit power should be decreased when receive level or receive quality is above the specified threshold.

Transmit power should be increased when receive level or receive quality is below the specified threshold.

The decision on Power Control is based on both receive level and receive quality; thus, the accuracy and effectiveness can be improved.

Power Control is performed to achieve the desired QoS with minimum possible transmit power. The reduction in the transmit power of the MS or BTS leads to the decrease in adjacent channel interference and power consumption.

There are two types of Power Control:

Uplink Power Control Uplink Power Control is used to adjust the transmit power of the MS, so that the receive signal strength of the BTS remains stable, and adjacent channel interference and MS power consumption are decreased.

Downlink Power Control Downlink Power Control is used to adjust the transmit power of the BTS, so that the receive signal strength of the MS remains stable, and adjacent channel interference and BTS power consumption are decreased.

Uplink Power Control and downlink Power Control adopt the same algorithms, although different parameters are involved. Unless otherwise specified, the algorithms described in this document apply to both uplink Power Control and downlink Power Control.

Figure 3-1 shows the procedure of Power Control.

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Figure 3-1 Procedure of Power Control

MS/BTS measures receive level and receive quality

Power Control is performed

Power Control Decision

Whether to perform Power Control

Start

End

Yes

No

As shown in Figure 3-1, the procedure of Power Control is as follows:

1. The MS/BTS measures the receive level and receive quality and then forwards the information to the BTS/BSC through measurement reports (MRs).

2. The BSS calculates the suitable transmit power of the MS or BTS using the algorithms and then decides whether Power Control should be performed. If yes, the BSS sends the decision to the MS/BTS through an MS Power Control/BS Power Control message.

3. The MS/BTS transmits signals at the power specified in the message.

3.1.1 Measurement of Receive Level and Receive Quality The MS/BTS measures the receive level and receive quality and then reports the information to the BTS/BSC through MRs. The MRs can be processed at the BSC or BTS, which is specified by MR.Preprocessing. If MR.Preprocessing is set to Yes, the MRs are processed at the BTS. The contents and processing period of MRs from the BTS to the BSC are specified by Transfer Original MR, Transfer BTS/MS Power Class, and Sent Freq.of preprocessed MR. Therefore, the signaling flow over the Abis interface and the load of the BSC can be controlled.

If the BTS sends the original MRs, the BSC performs MR interpolation and filtering. If the BTS sends the preprocessed MRs, the BTS performs Power Control decision. The original MRs trigger Power Control at the BSC, whereas the preprocessed MRs trigger Power Control at the BTS. The Power Control procedure at the BTS is similar to that at the BSC. Here, the Power Control performed by the BSC is taken as an example:



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The BSC processes the information in the MRs according to the Measurement Report Type. The BSC obtains the measurement results associated with the serving cell and neighboring cells from the MRs sent by the BTS.

The measurement values in the MRs are classified into FULL SET and SUB SET. FULL SET indicates the measurement value when signals are transmitted continuously. SUB SET indicates the measurement value when discontinuous transmission (DTX) is adopted. The MRs from the MS and BTS indicate whether the DTX is adopted. For details on the DTX, see the DTX feature.

If the DTX is adopted, SUB SET value is used during a call; otherwise, FULL SET value is used during a call. FULL SET and SUB SET are irrelevant to the receive signal strength on the BCCH in neighboring cells.

3.1.2 Power Control Algorithms Huawei algorithms for Power Control consist of Huawei II Power Control algorithm, Huawei III Power Control algorithm, and optimized Huawei III Power Control algorithm. These algorithms which differ in the purpose of power control and the process of decision-making. The process of the optimized Huawei III Power Control algorithm is the same as the process of Huawei III Power Control algorithm.

Huawei II Power Control algorithm involves the following aspects:

MR compensation Prediction filtering Dual-threshold Power Control algorithm Variable Power Control step Adaptive Power Control Adjustment of the upper threshold of signal strength in the case of bad signal quality Separate configuration of the adjustment step for uplink and downlink Power Control

Compared with Huawei II Power Control algorithm, Huawei III Power Control algorithm has the following new functions:

Exponential filtering and slide-window filtering Interpolation optimization Comprehensive decision based on receive level and receive quality Different thresholds for different speech rate types Consideration of impact of frequency hopping (FH) gain on receive quality

Compared with Huawei III Power Control algorithm, the optimized Huawei III Power Control algorithm has the following improvements:

MR power control compensation Dual-coefficient MR filtering algorithm Power control based on dual-step factor to protect weak power level areas

3.1.3 Power Control Procedure The downlink power control procedure is that when the BTS receives the BS POWER CONTROL message sent by the BSC, the BTS transmits signals at the power specified in the message.

The uplink power control procedure is different from the downlink power control procedure.

The uplink power control procedure involves three SACCH MR periods. In the first period, the BTS sends the MS a power control command message. In the second period, the MS performs the power


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adjustment. In the third period, the MS notifies the BTS of the adjusted power. Figure 3-2 shows the procedure of Power Control.

Figure 3-2 Uplink power control procedure

SA 0 SA 3SA2SA 1SA 0SA 3SA 2SA 1SA 0SA 3SA 2SA 1

BTS sends a power and TA

adjustment command in the

header of SACCH

MS adopts new power

and TA

MS sends the MR in the previous

multiframe

MS receives SACCH

message block

MS constructs the header of new

SACCH to report information on the new power and TA

BTS receives the MR

SACCH MR period: 4 × 26 = 104 frames (480 ms)

SACCH is sent in the 12th frame of the

26 multiframes

During the three SACCH MR periods that are defined by the parameter PC Interval, the procedure of Power Control is as follows:

The default value of PC Interval is 3. The value indicates the following three MR periods. You are advised to accept the default value, because a value smaller than 3 leads to excessively frequent performance of Power Control, and a value greater than 3 leads to delayed performance of Power Control.

1. The first SACCH MR period The BTS sends a power and TA adjustment command in the SACCH header. On receiving the command, the MS starts to perform Power Control in the second MR period.

2. The second SACCH MR period The MS adjusts its transmit power as follows: − If the power is adjusted in steps of 16 dB, one MR period (104 frames or 480 ms) is required for the power adjustment process.

− If the power is adjusted in steps of 32 dB, two MR periods are required for the power adjustment process.

The maximum rate for an MS to adjust its power is 2 dB every 13 frames or 60 ms.

3. The third SACCH MR period The current transmit power, which is the power level of the last burst in the previous SACCH MR period, is saved and is reported to the BTS in the next MR on the uplink SACCH.

3.2 Huawei II Power Control Algorithm Huawei II Power Control algorithm involves MR compensation, prediction filtering, and calculation of adjustment step based on receive level and receive quality, as shown in Figure 3-3.



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Figure 3-3 Procedure of Huawei II Power Control algorithm

Calculation of power adjustment step based on RxLev and RxQual

Start

Calculation of power adjustment step based on RxQual

End


MR Processing

Calculation of power adjustment step based on RxLev

1. MR Processing The MR processing in Huawei II Power Control algorithm involves the following stages:

a. MR interpolation If the latest MR received by the BSC is not in continuous relation with those buffered in the queue and the number of lost MRs does not exceed Allowed MR Number Lost, the MR interpolation is performed. The value of MS transmit power (MSPwr) missing from the MRs is not interpolated. In such a case, MR filtering is not affected, and Power Control procedure proceeds normally.

b. MR compensation While determining whether to perform Power Control, the BSC performs weighted filtering on the receive level and receive quality in certain history MRs. The MRs may be obtained by the BTS or MS at varying transmit power. To ensure the accuracy of the receive level and receive quality for filtering, their values in the history MRs that are obtained at a transmit power different from the current power must be compensated. If the currently interpolated MRs and the compensated MRs are filtered together, the decision on Power Control can be more effective. MR compensation is performed when the parameter MR. Compensation Allowed is set to Yes. The MR compensation is calculated as follows:


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− If the power level in the MR from the MS or BTS is higher than that in the previous MR, it indicates that the power is decreased. In such a case, the BSS subtracts the decreased power of the MS or BTS from the uplink or downlink receive level in all the MRs (decreased power level x 2 dBm).

− If the power level in the MR from the MS or BTS is lower than that in the previous MR, it indicates that the power is increased. In such a case, the BSS adds the increased power of the MS or BTS to the uplink or downlink receive level in all the MRs (increased power level x 2 dBm).

The MR compensation applies only to the receive level, but not to the receive quality.

c. Discarding of MRs in the initial phase of connection In the initial phase of connection, the BSC does not perform Power Control due to the huge fluctuation of data in the MRs. Huawei II Power Control algorithm discards the first four MRs, which are not involved in MR filtering.

d. MR filtering The decision on Power Control is made on the basis of the average filtering value in the history MRs, which is the reference value of the current receive level. The number of MRs involved in the filtering process is specified by Filter Length for UL RX_LEV/Filter Length for DL RX_LEV and Filter Length for UL Qual./Filter Length for DL Qual.. Due to the interval between the Power Control decision and power adjustment, the history MRs cannot accurately indicate the radio conditions or provide receive level and receive quality in real time when power adjustment is performed. Therefore, the prediction filtering is adopted to minimize the impact of the delay on power adjustment. In the prediction filtering of MR, the BSC performs weighted filtering on some sampling MRs. Generally, the interval between Power Control decision and power adjustment is three MRs. Prediction filtering can ensure the accuracy by predicting the subsequent zero to three MRs. The number of sampling MRs is specified by UL MR. Number Predicted/DL MR. Number Predicted. After filtering the predicted MRs and the interpolated and compensated MRs (or interpolated but no compensated MRs), the BSC makes a decision on Power Control. After the prediction filtering function is enabled, the MRs, on which Power Control decision is based, can accurately indicate the radio conditions when power adjustment is performed. Thus, the delay in power adjustment can be minimized.

The prediction filtering applies only to the receive level. Mean-value filtering is applied when Filter Length for UL RX_LEV/Filter Length for DL RX_LEV is less than 5 or UL MR. Number Predicted/DL MR. Number Predicted is 0.

2. Power Control Decision The Power Control decision in Huawei II Power Control algorithm involves the following stages:

a. Calculation of power adjustment step based on receive level (RxLev) − When RxLev < UL RX_LEV Lower Threshold/DL RX_LEV Lower Threshold, the power should be increased. The formula is as follows: Power adjustment step = min{|(UL RX_LEV Upper Threshold/DL RX_LEV Upper Threshold + UL RX_LEV Lower Threshold/DL RX_LEV Lower Threshold) ÷ 2 - RxLev|, MAX Up Adj. PC Value by RX_LEV}

− When RxLev > UL RX_LEV Upper Threshold/DL RX_LEV Upper Threshold, the power should be decreased. The poorer the receive quality, the more sensitive the level adjustment. Therefore, the BSS adjusts the receive quality when decreasing the power based on RxLev. In Huawei II Power Control algorithm, receive quality is classified into three quality zones (0, 1-2, ≥3). The maximum step of power adjustment on downlink is different for the three quality zones. The step is specified by MAX Down Adj.Value Qual.Zone 0/MAX Down Adj.Value Qual.Zone 1/MAX Down Adj.Value



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Qual.Zone 2. The adjustment step is calculated according to receive quality only when the power is decreased according to RxLev. The formula is as follows: Power adjustment step = min{|(UL RX_LEV Upper Threshold/DL RX_LEV Upper Threshold + UL RX_LEV Lower Threshold/DL RX_LEV Lower Threshold) ÷ 2 - RxLev|, MAX Down Adj.Value Qual.Zone 0/MAX Down Adj.Value Qual.Zone 1/MAX Down Adj.Value Qual.Zone 2}

The symbol | indicates absolute value.

b. Calculation of power adjustment step based on receive quality (RxQual) − When RxQual ≥ UL Qual. Lower Threshold/DL Qual. Lower Threshold, the power should be increased. The adjustment step is specified by MAX Up Adj. PC Value by Qual.. The power can be increased only when RxLev + MAX Up Adj. PC Value by Qual. ≤ UL RX_LEV Upper Threshold/DL RX_LEV Upper Threshold. The value of UL Qual. Bad UpLEVDiff/DL Qual. Bad UpLEVDiff must be increased when RxQual ≥ UL Qual. Bad Trig Threshold/DL Qual. Bad Trig Threshold, so as to ensure the increase in power when RxQual is poor.

− When RxQual < UL Qual. Upper Threshold/DL Qual. Upper Threshold, the power should be decreased. The adjustment step is specified by MAX Down Adj. PC Value by Qual.. The power can be decreased only when RxLev - MAX Down Adj. PC Value by Qual. ≥ UL RX_LEV Lower Threshold/DL RX_LEV Lower Threshold. c. Calculation of power adjustment step based on both RxLev and RxQual

To ensure the stability of power adjustment, both AdjStep_Lev and AdjStep_Qual should be taken into consideration. For details, see Table 3-1.

Table 3-1 Comprehensive decision on power adjustment

RxLev RxQual

Decrease AdjStep_Lev

Increase AdjStep_Lev

No adjustment

Decrease AdjStep_Qual

Decrease Max(AdjStep_lev, AdjStep_Qual)

Increase AdjStep_Lev Decrease AdjStep_Qual

Increase AdjStep_Qual

No adjustment Increase Max(AdjStep_lev, AdjStep_Qual)

Increase AdjStep_Qual

No adjustment Decrease AdjStep_Lev

Increase AdjStep_Lev No adjustment

Corresponding to Table 3-1, Figure 3-4 shows the power adjustment.


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Figure 3-4 Power adjustment

Receive Level

Receive Quality

UL/DL Qual. Upper Threshold

UL/DL Qual. Lower Threshold

UL/DL RX_LEV Lower Threshold

UL/DL RX_LEV Upper Threshold

0

70 6

↑MAX(AdjStep_Lev,

AdjStep_Qul)

↑AdjStep_Qul No Action

↑AdjStep_Lev No Action

↓MAX(AdjStep_L

ev,AdjStep_Qul)

↑AdjStep_Lev

↓AdjStep_Qul

↓AdjStep_Lev

3

The procedure of Power Control for AMR calls is the same as that for non-AMR calls; however, different parameters are involved. For details, see AMR Power Control of the AMR feature.

3.3 Huawei III Power Control Algorithm Huawei III Power Control algorithm involves MR interpolation, MR filtering, calculation FH gain, and calculation of adjustment step based on the FH gain, as shown in Figure 3-5.



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Figure 3-5 Procedure of Huawei III Power Control algorithm

MR interpolation

Start

Calculation of FH gain

Calculation of power adjustment step based on

FH gain


End

MR filtering (exponential filtering and

slide-window)

1. MR Processing When Huawei III Power Control algorithm is applied, a fixed number of MRs are discarded during the initial access of the MS to the network to prevent the impact of inaccurate MRs on the algorithm. The number of discarded MRs is specified by SdMrCutNum and TchMrCutNum.

If active Power Control is enabled, the MRs are not discarded.

The MR processing in Huawei III Power Control algorithm involves the following stages: a. MR interpolation

− Interpolation is applied to the values missing from the MRs. The missing level value is replaced with the value in the last MR. The missing quality value is always replaced with 7.

− The value of MS/BTS transmit power missing from the MRs is not interpolated. In such a case, MR filtering is not affected, and Power Control procedure proceeds normally.


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− The interpolation is not performed in the case that the measurement results are lost. − If the number of continuously lost MRs is greater than the value of MRMissNumber, the BSC stops Power Control procedure. The procedure will resume when a new MR is received. b. MR filtering

MR filtering in Huawei III Power Control algorithm involves exponential filtering and slide-window filtering, instead of mean-value filtering in Huawei II Power Control algorithm. In the process of calculation, receive quality is converted into C/I. In MR filtering, exponential filtering and slide-window filtering are performed on C/I and receive level in succession. The measurement value obtained through the filtering is used to decide whether Power Control is performed. In Huawei III Power Control algorithm, the filtering period is specified by the parameters UL(DL)RexLevExponentFilterLen, UL(DL)RexQualExponentFilterLen, UL(DL)RexLevSlideWindow, and UL(DL)RexQualSlideWindow.

In this document, the UL(DL) means two separate parameter prefixes. For example, UL(DL)RexLevExponentFilterLen means ULRexLevExponentFilterLen and DLRexLevExponentFilterLen.

2. Power Control Decision Power Control decision in Huawei III Power Control algorithm involves the following stages: First, the gain of the channels on the Um interface is obtained through calculation. Then, the adjustment step is calculated on the basis of the gain, RxLev, and RxQual after the filtering. The calculated step will be checked to determine whether it exceeds the maximum step allowed. If it is within the specified range, Power Control is performed.

a. Decision on whether Power Control should be performed When UL(DL)RexLevHighThred ≥ RxLev ≥ UL(DL)RexLevLowThred, and UL**RexQualHighThred Rex or DL**RexQualHighThred ≥ RxQual + QOffFh ≥ UL**RexQualLowThred or DL**RexQualLowThred, Power Control is not required. Otherwise, the calculation of the adjustment step starts. The value of QOffFh can be obtained in the FH gain table, according to the number of frequencies participating in FH in the mobile allocation (MA). For details, see Table 3-2. If the number of frequencies in the MA is greater than 8, take the gain value corresponding to 8 as the value of QOffFh.

In Huawei III Power Control algorithm, different quality level thresholds are set for different speech coding schemes.

The symbol ** represents Full-rate Service (FS), Half-rate Service (HS), AMR Full-rate Service (AFS), or AMR Half-rate Service (AHS).

QOffFh indicates FH gain.

Table 3-2 Mapping between MA frequencies and FH gain

MA Frequencies 1 2 3 4 5 6 7 8

QOffFh (dB) 0 2 3 4 4.3 4.7 5.0 5.3

In decision-making phase, if the current call is an AMR call and Allow III Power Control For AMR is set to off, then power control is not applied to this call. If the current call is a non-AMR call, and Allow III Power Control For Non-AMR is set to off, then power control is not applied to this call. If the user closes these two switches during the call, then the BSC changes the power level of the current call to level 0

b. Calculation of adjustment step − Calculation of BTS Power Control step



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The Power Control adjustment step is calculated according to RxLev and RxQual in every adjustment period specified by the parameter PwrCtrlDLAdjPeriod. The formula is as follows: Step(k) = –{DLRexLevAdjustFactor x (BsTxMaxPower – g(k) – SThr) + DLRexQualAdjustFactor x (qa_filtered(k) + QOffFh – QThr)} If step(k) > 0, the result is taken as 0.

− Calculation of MS Power Control step The Power Control adjustment step is calculated according to RxLev and RxQual in every adjustment period specified by the parameter PwrCtrlDLAdjPeriod. The formula is as follows: Step(k) = –{ULRexLevAdjustFactor x (MsTxMaxPower – g(k) – SThr) + ULRexQualAdjustFactor x (qa_filtered(k) + QOffFh – QThr)} If step(k) > 0, the result is taken as 0.

The parameters involved in the previous formulas are interpreted as follows: − SThr = (UL(DL)RexLevHighThred/DLRexLevHighThred + UL(DL)RexLevLowThred/DLRexLevLowthred) ÷ 2

− QThr = (UL**RexQualHighThred/DL**RexQualHighThred + UL**RexQualLowThred/DL**RexQualLowThred) ÷ 2

− BsTxMaxPower indicates the maximum transmit power allowed by the TRX that carries the call and is specified by the parameter Power Level.

− MsTxMaxPower indicates the maximum transmit power of the MS, which is contained in the classmark information reported by the MS.

− g(k) indicates the radio channel gain calculated by Huawei III Power Control algorithm. − qa_filtered(k) indicates the measurement results after the filtering. The maximum value of step(k) is specified by the parameter ULMAXDownStep/ULMAXUpStep, so that excessive adjustment is prevented. If step(k) exceeds the maximum value, the specified maximum value is adopted as the adjustment step.

In current Huawei III Power Control algorithm, the minimum transmit power control level of MSs is 2dB. The power adjustment is coarse. When the precise control switch 0.2dB Power Control Enable is set to YES(Yes), the power control step is 0.2dB. Small level provides a more accurate power control.



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3.4 Optimized Huawei III Power Control Algorithm The process of the optimized Huawei III Power Control algorithm is the same as the process of Huawei III Power Control algorithm. The optimized Huawei III Power Control algorithm involves MR processing, MR filtering, calculation of the power control step, and power control execution. The optimized Huawei III Power Control algorithm takes effect when Power Control Switch is set to PWR3(Power control III) and III Power Control Optimized Enable is set to YES(Yes).

This section describes the improvements of the optimized Huawei III Power Control algorithm on Huawei III Power Control algorithm.

MR power control compensation MR power control compensation aims to compensate the receive level and receive quality so that they reach the measured values at the maximum transmit power. In the optimized Huawei III Power Control algorithm, the receive level and receive quality reported through the MR are compensated. Subsequently, the receive level after compensation and the receive quality after compensation are used as inputs for MR filtering.

Dual-coefficient MR filtering algorithm The optimized Huawei III Power Control algorithm adopts the exponential filtering algorithm and MR filtering adopts the dual-coefficient filtering algorithm. The dual-coefficient filtering algorithm concerns the receive level and the receive quality. This algorithm has a strong correlation with the filtering period K and the filter adjustment factor FiltAdjustFactor. The values of K and FiltAdjustFactor vary with the measured receive level and receive quality: − The value of K depends on ULRexLevExponentFilterLen/DLRexLevExponentFilterLen and ULRexQualExponentFilterLen/DLRexQualExponentFilterLen.

− The value of FiltAdjustFactor depends on III UL Filter Adjust Factor/III DL Filter Adjust Factor.

In this section, the symbol / separates two independent parameters. For example,

"ULRexLevExponentFilterLen/DLRexLevExponentFilterLen" indicates ULRexLevExponentFilterLen or DLRexLevExponentFilterLen. ULRexLevExponentFilterLen and DLRexLevExponentFilterLen take effect in uplink power control and downlink power control respectively.

In Huawei III Power Control algorithm, different quality level thresholds are set for different speech coding schemes. The symbol ** in this section represents Full-rate Service (FS), Half-rate Service (HS), AMR Full-rate Service (AFS), or AMR Half-rate Service (AHS).

In the dual-coefficient exponential filtering algorithm, the filter response rate increases when the radio propagation environment deteriorates, whereas the rate of increasing the filtering value decreases when the radio propagation environment becomes better.

Calculation of the power control step The power control step of the optimized Huawei III Power Control algorithm is calculated on the basis of two step factors: step1(k) and step2(k).

step1(k) is determined by RexLev Protect Factor, RexQual Protect Factor, STarget, and QTarget. The calculation formula is as follows:

− step1(k) = - {RexLev Protect Factor x (ca_filtered(k) - SThr) + RexQual Protect Factor x (qa_filtered(k) + QOffFh - QThr)}

Where, − RexLev Protect Factor indicates III UL RexLev Protect Factor/III DL RexLev Protect Factor. − ca_filtered(k) indicates the measured receive level after the filtering. − SThr = ("ULRexLevHighThred/DLRexLevHighThred"+"ULRexLevLowthred/DLRexLevLowthred")/2.


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− RexQual Protect Factor indicates III UL RexQual Protect Factor/III DL RexQual Protect Factor. − qa_filtered(k) indicates the measured receive quality after the filtering. − QThr = ("UL ** Rex Qual. Upper Threshold/DL ** Rex Qual. Upper Threshold" + "UL ** Rex Qual.Lower Threshold/DL ** Rex Qual.Lower Threshold")/2.

− QOffFh indicates FH gain. step2(k) is determined by RexLev Adjust Factor, Rex Qual.Adjust Factor, STarget, and QTarget. The calculation formula is as follows: − step2(k) = - {sfactor x (ca_filtered(k) - SThr) + qfactor x (qa_filtered(k) + QOffFh - QThr)} Where, − sfactor indicates ULRexLevAdjustFactor/DLRexLevAdjustFactor. − ca_filtered(k) indicates the measured receive level after the filtering. − SThr = ("ULRexLevHighThred/DLRexLevHighThred"+"ULRexLevLowthred/DLRexLevLowthred")/2. − qfactor indicates ULRexQualAdjustFactor/DLRexQualAdjustFactor. − qa_filtered(k) indicates the measured receive quality after the filtering. − QThr = ("UL ** Rex Qual. Upper Threshold/DL ** Rex Qual. Upper Threshold"+"UL ** Rex Qual.Lower Threshold/DL ** Rex Qual.Lower Threshold")/2.

− QOffFh indicates FH gain. The step factor step(k) is determined according to the formula step(k) = max(step1(k), step2(k)). Subsequently, based on this step factor, power control adjustment is performed. If step(k) is greater than 0, then step(k) is equal to 0, that is, transmit power is not adjusted.

In current Optimized Huawei III Power Control algorithm, the minimum transmit power control level of MSs is 2dB. The power adjustment is coarse. When the precise control switch 0.2dB Power Control Enable is set to YES(Yes), the power control step is 0.2dB. Small level provides a more accurate power control.



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3.5 Functions Related to Power Control 3.5.1 Active Power Control Power Control is used to control the transmit power of the MS and BTS during a connection. For better results of Power Control, the MS and BTS should transmit signals at a proper power instead of the maximum power when the connection is initially established. To achieve this, Active Power Control should be enabled.

Active Power Control enables the immediate performance of Power Control after an MS successfully gains access to the network or a handover is successfully performed in the BSC. In such a case, the BSC can control the uplink and downlink power promptly. Therefore, both the BTS and the MS transmit signals at a proper power. Active Power Control aims to reduce the system interference, improve the QoS, and decrease the power consumption of both the BTS and MS.

Active Power Control is enabled when the parameter Power Forecast Allowed is set to Yes.

Active Power Control During the Access of an MS The procedure of active Power Control during the initial access of an MS is as follows:

1. The BSC acquires the uplink and downlink path loss on the basis of the receive level in the MR of the MS on the immediate assignment channel, transmit power of MS and BTS, and parameters Double Antenna Gain, Combiner Loss, and Path Loss of Different Frequency Band.

2. Based on the uplink and downlink path loss and the parameters Expected UL RX_LEV and Expected DL RX_LEV, the BSC estimates the transmit power that the BTS and MS should adopt on the assigned traffic channel.

3. The MS adopts the previously-mentioned power as the transmit power when it is initially assigned with a traffic channel, thus reducing the initial transmit power.

Active Power Control During Inner-BSC Handover The procedure of active Power Control during inner-BSC handover is as follows:

1. The BSC acquires the uplink and downlink path loss on the basis of the level of the BCCH in the target cell, transmit power of MS and BTS, and value of Path Loss of Different Frequency Band.

2. Based on the uplink and downlink path loss and the parameters Expected UL RX_LEV and Expected DL RX_LEV, the BSC estimates the transmit power that the BTS and MS should adopt on the channel of the target cell.

3. The MS adopts the previously-mentioned power as the transmit power when it gains access to the target cell, thus reducing the transmit power during the access.

3.5.2 SAIC Power Control Optimization Single Antenna Interference Cancellation (SAIC) is used to reduce the impact of interference on the reception of downlink signals through a signal processing technology.

An MS enabled with SAIC has improved ability of anti-interference. After SAIC is enabled, the thresholds for BTS/MS Power Control are adjusted to improve the radio performance of the BSS. SAIC is enabled when the parameters SAIC Allowed and Switch for BTS Supporting SAIC PC Adjust are set to Yes. The strategies for threshold adjustment are as follows:

When Huawei II Power Control algorithm is applied, the value of Power Control threshold Adjust for SAIC is added to that of DL Qual. Upper Threshold and DL Qual. Lower Threshold.

When Huawei III Power Control algorithm is applied, the value of Power Control threshold Adjust for SAIC is deducted from that of DL**RexQualHighThred and DL**RexQualLowThred.


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** indicates FS (full rate), HS (half rate), AFS (AMR full rate), or AHS (AMR half rate).

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4 Parameters This chapter describes the parameters related to power control.

For the meaning of each parameter, see Table 4-1. For the default value, value ranges, and MML commands of each parameter, see Table 4-2.

Table 4-1 Parameter description (1)

Parameter Description

Allow III Power Control For AMR

Whether to enable the III power control algorithm for AMR calls. If enabled, power control is performed on AMR calls.

Allow III Power Control For Non-AMR

Whether to enable the III power control algorithm for Non-AMR calls. If enabled, power control is performed on Non-AMR calls.

Allowed MR Number Lost

If the number of measurement reports lost consecutively is no larger than this value, linear interpolation is performed for the values in the lost measurement reports based on the values in the two measurement reports preceding and following the lost measurement reports. Otherwise, the lost measurement reports will be discarded, and the value will be recalculated when new measurement reports arrive.

Combiner Loss Combined loss used to estimate the downlink power during assignment

DL MR. Number Predicted

Number of downlink measurement reports that the BSC predicts. The BSC takes a while to confirm the power control effect of a power control command. Thus, the BSC makes a power control decision based on a measurement report that lags behind the changes in the receive level and quality instead of reflecting the real-time radio environment. As a result, the power control is late.To prevent late power control to a certain degree, the power control algorithm involves a measurement report prediction filter. The BSC can sample several downlink measurement reports in a short time and then weight them to predict future N measurement reports.This parameter specifies thenumber N.

DL Qual. Bad Trig Threshold

During downlink power control, if the downlink receive quality level is equal to or greater than "DL Qual, bad Trig Threshold", "DL RX_LEV Upper Threshold" is increased by "DLQual. Bad UpLEVDiff" to further increase the expected downlink power level.

DL Qual. Bad UpLEVDiff

During downlink power control, if the downlink receive quality level is equal to or greaterthan "DL Qual, bad Trig Threshold", "DL RX_LEV Upper Threshold" is increased by "DLQual. Bad UpLEVDiff" to further increase the expected downlink power level.

DL Qual. Lower Threshold

Quality level threshold for increasing downlink signal power. If the BTS transmits signals at a quality level greater than this threshold, the BSC increases the power of theBTS. If (downlink receive level + "MAX Up Adj. PC Value by Qual.") > "DL RX_LEV Upper Threshold", however, the BSC does not adjust the transmit power.

DL Qual. Upper Threshold

Quality level threshold for decreasing downlink signal power. If the BTS transmits signals at a quality level less than this threshold, the BSC decreases the power of the BTS. If (downlink receive level - "MAX Down Adj. PC Value by Qual.") < "DL RX_LEV Lower Threshold", however, the BSC does not adjust the transmit power.

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DL RX_LEV Lower Threshold

Lower threshold for downlink signal strengthIf the downlink received signal level is less than this threshold, a power increase is computed. Then, the power is increased by the least of the power increase, "MAX Up Adj. PC Value by RX_LEV", and "MAX Up Adj. PC Value by Qual.".Power increase = ("DL RX_LEV Upper Threshold" + "AMR DL RX_LEV Lower Threshold")/2 - downlink received signal level

DL RX_LEV Upper Threshold

Upper threshold for downlink signal strengthIf the downlink received signal level is greater than this threshold, a power decrease is computed. Then, the power is decreased by the least of the power decrease, maximum power adjustment step allowed by the quality zone to which the received signal quality belongs, and "MAX Down Adj. PC Value by Qual.".Power decrease = downlink received signal level - ("DL RX_LEV Upper Threshold" + "AMR DL RX_LEV Lower Threshold")/2The maximum power adjustment step allowed by the quality zone is chosen from "MAX Down Adj.Value Qual.Zone 0", "MAX Down Adj.Value Qual.Zone 1", and "MAX Down Adj.Value Qual.Zone 2" according to the quality zone.

DLAFSRexQualHighThred

If the downlink receive quality level of an AMR full rate call is greater than this parameter, the call needs to undergo Huawei power control generation III.

DLAFSRexQualLowThred

If the downlink receive quality level of an AMR full rate call is smaller than this parameter, the call needs to undergo Huawei power control generation III.

DLAHSRexQualHighThred

If the downlink receive quality level of an AMR half rate call is greater than this parameter, the call needs to undergo Huawei power control generation III.

DLAHSRexQualLowThred

If the downlink receive quality level of an AMR half rate call is smaller than this parameter, the call needs to undergo Huawei power control generation III.

DLFSRexQualHighThred

Upper quality threshold for Huawei power control generation III on a full rate call. If the downlink receive quality level of a full rate call is greater than this threshold, the call needs to undergo Huawei power control generation III.

DLFSRexQualLowThred

Lower quality threshold for Huawei power control generation III on a full rate call. If the downlink receive quality level of a full rate call is smaller than this threshold, the call needs to undergo Huawei power control generation III.

DLHSRexQualHighThred

Upper quality threshold for Huawei power control generation III on a half rate call. If the downlink receive quality level of a half rate call is greater than this threshold, the call needs to undergo Huawei power control generation III.

DLHSRexQualLowThred

Lower quality threshold for Huawei power control generation III on a half rate call. If the downlink receive quality level of a half rate call is smallter than this threshold, the call needs to undergo Huawei power control generation III.

DLRexLevAdjustFactor

Percentage of signal strength in the factors by which to determine the downlink power control step

DLRexLevExponentFilterLen

Length of the exponential filter for downlink signal strength. A single measurement report may not reflect the actual network situations accurately. Therefore, the BSC needs to filter the measured values in several successive measurement reports to reflect the radio environment.

DLRexLevHighThred

Upper receive level threshold for downlink power control. If the downlink receive level is greater than this threshold, the power of the downlink signal needs to be decreased.



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DLRexLevLowthred

Lower receive level threshold for downlink power control. If the downlink receive level issmaller than this threshold, the power of the uplink signal needs to be increased.

DLRexLevSlideWindow

Length of the slide window filter for downlink signal strength. A single measurement report may not reflect the actual network situations accurately. Therefore, the BSC needs to filter the measured values in several successive measurement reports to reflect the radio environment.

DLRexQualAdjustFactor

Percentage of quality level in the factors by which to determine the downlink power control step

DLRexQualExponentFilterLen

Length of the exponential filter for downlink signal quality. A single measurement report may not reflect the actual network situations accurately. Therefore, the BSC needs to filter the measured values in several successive measurement reports to reflect the radio environment.

DLRexQualSlideWindow

Length of the slide window filter for downlink signal quality. A single measurement report may not reflect the actual network situations accurately. Therefore, the BSC needs to filter the measured values in several successive measurement reports to reflect the radio environment.

Double Antenna Gain Dual-antenna gain used to estimate the downlink power during assignment

Expected DL RX_LEV

Received signal strength at an MS expected in power forecast, which helps to computethe initial transmit power of the BTS

Expected UL RX_LEV

Received signal strength at the BTS expected in power forecast, which helps to compute the initial transmit power of an MS

Filter Length for DL Qual.

Number of measurement reports sampled for averaging downlink signal quality. A single measurement report may not reflect the actual network situations accurately. Therefore, the BSC needs to average the measured values in several successive measurement reports to reflect the radio environment.

Filter Length for DL RX_LEV

Number of measurement reports sampled for averaging downlink signal strength. A single measurement report may not reflect the actual network situations accurately. Therefore, the BSC needs to average the measured values in several successive measurement reports to reflect the radio environment.

Filter Length for UL Qual.

When the network receives measurement reports, the measurement values in several straight measurement reports are filtered to reflect the radio operating environment for the sake of accuracy. This parameter specifies the number of measurement reports sampled for filtering the uplink signal quality.

Filter Length for UL RX_LEV

When the network receives measurement reports, in consideration of the accuracy of a single measurement report, the measurement values in certain measurement reports are filtered to represent the radio operating environment. This parameter specifies the number of measurement reports sampled for filtering the uplink signal strength.

III DL Filter AdjustFactor

Filter adjustment factor for downlink power control. Setting this parameter high helps to smooth the filtered values and to reduce the impact of poor measurement reports on the filtered values. Setting this parameter low helps to draw the filtered values close to the actual values and to heighten the power control effect.

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III DL RexLev Protect Factor

A power control step cannot exceed the step computed according to "III DL RexLev Protect Factor" and "III DL RexQual Protect Factor".

III DL RexQual Protect Factor


III DL RexQual Protect Factor


III Power Control Optimized Enable Whether to enable the optimized power control algorithm III

III UL Filter AdjustFactor

Filter adjustment factor for uplink power control. If this parameter is set to a large value,the filtered values become smooth, thus reducing the impact of poor measurement reports on the filtered values. If this parameter is set to a small value, the filter values are close to the actual ones and thus the power control speed is increased.

III UL RexLev Protect Factor

Signal strength factor for the protective limitation on calculating the uplink power controladjustment step. The calculated step value cannot exceed the step value that is obtained on the basis of the signal strength protection factor and the signal quality protection factor.

III UL RexQual Protect Factor

Signal strength factor for the protective limitation on calculating the uplink power controladjustment step. The calculated step value cannot exceed the step value that is obtained on the basis of the signal strength protection factor and the signal quality protection factor.

MAX Down Adj. PC Value by Qual. Step of downward power adjustment according to the quality of the received signals

MAX Down Adj.Value Qual.Zone 0

Huawei power control algorithm II divides three quality zones according to the quality ofthe receive signals. When the power is downwardly adjusted according to the level, the maximum downward adjustment step can vary according to the quality of the received signals. This parameter specifies the maximum step of downward power adjustment when the quality of the received signals falls into quality zone 0.


Huawei power control algorithm II divides three quality zones according to the quality of the receive signals. When the power is downwardly adjusted according to the level, the maximum downward adjustment step can vary according to the quality of the received signals. This parameter specifies the maximum step of downward power adjustment when the quality of the received signals falls into quality zone 1.


Huawei power control algorithm II divides three quality zones according to the quality ofthe receive signals. When the power is downwardly adjusted according to the level, the maximum downward adjustment step can vary according to the quality of the received signals. This parameter specifies the maximum step of downward power adjustment when the quality of the received signals falls into quality zone 2.

MAX Up Adj. PC Value by Qual. Step of upward power adjustment according to the quality of the received signals

MAX Up Adj. PC Value by RX_LEV Step of upward power adjustment according to the quality of the received signals



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Measurement Report Type Type of the measurement report (MR) reported by the MS

MR. Compensation Allowed

Whether power control algorithm II allows measurement report compensation. When making a power control decision, the BSC retrieves a certain number of history measurement reports and performs weighted filtering on the receive level values and receive quality values in these reports, which may be obtained when different transmit powers were used by BTSs or MSs. To ensure that correct receive level values and receive quality values are used in filtering, you must compensate the receive level values and receive quality values in history measurement reports obtained when transmit powers different than the current one were used.

MR.Preprocessing

Whether to enable the BTS to preprocess measurement reports. This parameter determines where to conduct power control.

MRMissNumber When the number of the lost measurement reports exceeds this parameter during a power control period, the power control stops.

Path Loss of Different Frequency Band Transmission loss difference between radio frequencies on different bands

PC Interval Minimum interval between two consecutive power control commands

Power Control Switch Whether to enable power control algorithm II or power control algorithm III

Power Control Threshold Adjust for SAIC

Adjustment step of the downlink signal quality threshold in power control algorithm III for MSs that support SAIC. The network side uses a lower downlink signal quality threshold for SAIC-supported MSs in power control, thus lowering the transmit power of the corresponding BTS and reducing the interferences in the whole network.

Power Control Threshold Adjust for SAIC

Adjustment step of the downlink signal quality threshold in power control algorithm III for MSs that support SAIC. The network side uses a lower downlink signal quality threshold for SAIC-supported MSs in power control, thus lowering the transmit power ofthe corresponding BTS and reducing the interferences in the whole network.

Power Forecast Allowed

Whether to allow active power control. If this parameter is set to YES, the system performs power forecast in the process of initial access assignment or service channel activation during intra-BSC handovers, and sends the forecast initial power information to the BTSs through channel activation messages. In this way, the MSs and BTSs can adjust the transmit power. If this parameter is set to NO, the system does not perform power forecast, and the MSs and BTSs choose the maximum transmit power.

Power Level

This parameter specifies the transmit power level of the TRX. The greater this parameter is, the smaller the transmit power is. When this parameter is set to "0", the transmit power level of the TRX is the greatest. Each time this parameter increases by one level, the transmit power reduces by 2 dB.For different types of BTSs, the value range of this parameter is different.BTS3X: 0-10BTS3001C: 0-13BTS3002C: 0-10Double-transceiver BTSs (BTS3012,BTS3012AE,BTS3006C): 0-10DBS3900 GSM, BTS3900 GSM, BTS3900A GSM: 0-10.

PwrCtrlDLAdjPeriod Minimum interval between two consecutive downlink power control commands

SAIC Allowed Whether an MS supports the SAIC function

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SdMrCutNum Maximum number of discarded MRs allowed on the SDCCH in a power control period

Sent Freq.of preprocessed MR Frequency at which the BTSs submit pre-processed measurement reports to the BSC

Switch for BTS Supporting SAIC PC Adjust

Whether to specify "Power Control threshold Adjust for SAIC" in the MML command "SET GCELLPWR3"

TchMrCutNum Maximum number of discarded MRs allowed on the TCH in a power control period

Transfer BTS/MS Power Class Whether to enable the BTS to transfer BTS/MS power class to the BSC

Transfer Original MR

Whether the BTSs send the original measurement reports to the BSC after pre-processing them. When this parameter is set to YES, the BTSs sends the original and pre-processed measurement reports to the BSC.

UL MR. Number Predicted

After the BSC delivers the power control command, it should wait for a certain period before affirm the effect of the power control. Therefore, the MR that power control decision is based on cannot accurately reflect the radio environment during the power adjustment, but misses the latest changes of the receive level and receive quality of theMS. Thus, the power adjustment is delayed.To compensate the delay of power adjustment, the power control algorithm implements the prediction and filtering function.In other words, the BSC samples several uplink measurement reports, performs weighted filtering, and predicts N measurement reports from the current time onwards in a short period. This parameter determines the number of uplink measurement reports predicted by the BSC. In other words, the value of this parameter equals to the previous number N.

UL Qual. Bad Trig Threshold

In the case of power control, when the uplink receive quality is not smaller than "UL Qual. Bad Trig Threshold", the actual "UL RX_LEV Upper Threshold" is increased by "UL Qual. Bad UpLEVDiff".

UL Qual. Bad UpLEVDiff

In the case of power control, when the uplink receive quality is not smaller than "UL Qual. Bad Trig Threshold", the actual "UL RX_LEV Upper Threshold" is increased by "UL Qual. Bad UpLEVDiff".

UL Qual. Lower Threshold

The MS transmit power is increased only when the quality level of the MS transmit signal is greater than the value of the parameter. If (the uplink receive level + "MAX Up Adj. PC Value by Qual.]/PARA]) is greater than "UL RX_LEV Upper Threshold", the MStransmit power is not adjusted.

UL Qual. Upper Threshold

The MS transmit power is decreased only when the quality level of the MS transmit signal is smaller than the value of the parameter. If (the uplink receive level - "MAX Up Adj. PC Value by Qual.]/PARA]) is smaller than "UL RX_LEV Lower Threshold", the MS transmit power is not adjusted.

UL RX_LEV Lower Threshold

When the uplink receive level is below the threshold, Huawei II power control is performed.

UL RX_LEV Upper Threshold

When the uplink receive level reaches the threshold, Huawei II power control is performed.

ULAFSRexQualHighThred

Current call is an AMR full-rate call, and when the uplink receive quality is greater than the threshold, Huawei III power control is performed.



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ULAFSRexQualLowThred

Current call is an AMR full-rate call, and when the uplink receive quality is lower than the threshold, Huawei III power control is performed.

ULAHSRexQualHighThred

Current call is an AMR half-rate call, and when the uplink receive quality is greater thanthe threshold, Huawei III power control is performed.

ULAHSRexQualLowThred

Current call is an AMR half-rate call, and when the uplink receive quality is lower than the threshold, Huawei III power control is performed.

ULFSRexQualHighThred

Current call is a full-rate call, and when the uplink receive quality is greater than the threshold, Huawei III power control is performed.

ULFSRexQualLowThred

Current call is a full-rate call, and when the uplink receive quality is lower than the threshold, Huawei III power control is performed.

ULHSRexQualHighThred

Current call is a half-rate call, and when the uplink receive quality is greater than the threshold, Huawei III power control is performed.

ULHSRexQualLowThred

Current call is a half-rate call, and when the uplink receive quality is lower than the threshold, Huawei III power control is performed.

ULMAXDownStep

Maximum permissible adjustment step when the BSC decreases the uplink transmit power

ULMAXUpStep Maximum permissible adjustment step when the BSC increases the uplink transmit power

ULRexLevAdjustFactor Step adjustment ratio of the receive level in the uplink power control

ULRexLevExponentFilterLen

When the network receives measurement reports, the measurement values in several straight measurement reports are filtered to reflect the radio operating environment for the sake of accuracy. This parameter specifies the number of measurement reports sampled for exponent filtering of the uplink signal strength.

ULRexLevHighThred

When the uplink receive level reaches the threshold, Huawei III power control is performed.

ULRexLevLowThred

When the uplink receive level is lower than the threshold, Huawei III power control is performed.

ULRexLevSlideWindow

When the network receives measurement reports, the measurement values in several straight measurement reports are filtered to reflect the radio operating environment for the sake of accuracy. This parameter specifies the number of measurement reports sampled for slide-window filtering of the uplink signal strength.

ULRexQualAdjustFactor Step adjustment ratio of the receive quality in the uplink power control

ULRexQualExponentFilterLen

When the network receives measurement reports, the measurement values in several straight measurement reports are filtered to reflect the radio operating environment for the sake of accuracy. This parameter specifies the number of measurement reports sampled for exponent filtering of the uplink signal quality.

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ULRexQualSlideWindow

When the network receives measurement reports, the measurement values in several straight measurement reports are filtered to reflect the radio operating environment for the sake of accuracy. This parameter specifies the number of measurement reports sampled for slide-window filtering of the uplink signal quality.

Table 4-2 Parameter description (2)

Parameter Default Value GUI Value Range

Actual Value Range Unit MML

Command Impact

Allow III Power Control For AMR ON

OFF(Not Allowed), ON(Allowed) OFF, ON None

SET GCELLPWR3(Optional) Cell

Allow III Power Control For Non-AMR ON

OFF(Not Allowed), ON(Allowed) OFF, ON None


Allowed MR Number Lost 4 0~31 0~31 None

SET GCELLHOFITPEN(Optional) Cell

Combiner Loss 45 0~100 0~10, step:0.1 dB

SET GCELLPWRBASIC(Optional) Cell

DL MR. Number Predicted 0 0~3 0~3 None


DL Qual. Bad Trig Threshold 2 0~7 0~7 None


DL Qual. Bad UpLEVDiff 10 0~63 0~63 dB


DL Qual. Lower Threshold 2 0~7 0~7 None


DL Qual. Upper Threshold 0 0~7 0~7 None


DL RX_LEV Lower Threshold 28 0~63 0~63 dB




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GUI Value Actual Value MML Parameter Default Value Unit Impact Range Range Command

DL RX_LEV Upper Threshold 45 0~63 0~63 dB


DLAFSRexQualHighThred 14 1~30 1~30 dB


DLAFSRexQualLowThred 14 1~30 1~30 dB


DLAHSRexQualHighThred 16 1~30 1~30 dB


DLAHSRexQualLowThred 16 1~30 1~30 dB


DLFSRexQualHighThred 16 1~30 1~30 dB


DLFSRexQualLowThred 16 1~30 1~30 dB


DLHSRexQualHighThred 18 1~30 1~30 dB


DLHSRexQualLowThred 18 1~30 1~30 dB


DLRexLevAdjustFactor 3 0~10 0~10 None


DLRexLevExponentFilterLen 3 0~19

TCH:0~9120, step:480; SDCCH:0~8930, step:470 ms


DLRexLevHighThred 20 0~63 0~63 dB


DLRexLevLowthred 20 0~63 0~63 dB


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DLRexLevSlideWindow 1 1~20



DLRexQualAdjustFactor 6 0~10 0~10 None


DLRexQualExponentFilterLen 3 0~19



DLRexQualSlideWindow 1 1~20



Double Antenna Gain 30 0~255

0~25.5, step:0.1 dB


Expected DL RX_LEV 30 0~63 0~63 dB


Expected UL RX_LEV 30 0~63 0~63 dB


Filter Length for DL Qual. 5 1~20



Filter Length for DL RX_LEV 5 1~20



Filter Length for UL Qual. 5 1~20





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Filter Length for UL RX_LEV 5 1~20



III DL Filter Adjust Factor 3 1~10 1~10 None


III DL RexLev Protect Factor 5 0~100 0~100 None


III DL RexQual Protect Factor 55 0~100 0~100 None


III DL RexQual Protect Factor 55 0~100 0~100 None


III Power Control Optimized Enable NO

NO(No), YES(Yes) NO, YES None


III UL Filter Adjust Factor 3 1~10 1~10 None


III UL RexLev Protect Factor 6 0~100 0~100 None


III UL RexQual Protect Factor 75 0~100 0~100 None


MAX Down Adj. PC Value by Qual. 2 0~4 0~4 dB


MAX Down Adj.Value Qual.Zone 0 2 0~30 0~30 dB






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MAX Up Adj. PC Value by Qual. 8 0~32 0~32 dB


MAX Up Adj. PC Value by RX_LEV 8 0~32 0~32 dB


Measurement Report Type

ComMeasReport

EnhMeasReport(Enhanced Measurement Report), ComMeasReport(Common Measurement Report)

EnhMeasReport, ComMeasReport None

SET GCELLCCUTRANSYS(Optional) Cell

MR. Compensation Allowed YES



MR.Preprocessing

BTS_Preprocessing

BSC_Preprocessing(BSC preprocessing), BTS_Preprocessing(BTS preprocessing)

BSC_Preprocessing, BTS_Preprocessing None

SET GCELLHOCTRL(Optional) Cell

MRMissNumber 5 1~255 1~255 None


Path Loss of Different Frequency Band 79 0~255

0~25.5, step:0.01 dB


PC Interval 3 1~15



Power Control Switch PWR3

PWR2(Power control II), PWR3(Power controlIII) PWR2, PWR3 None


Power Control Threshold Adjust for SAIC 1 0~2 0~2 None




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Power Control Threshold Adjust for SAIC 1 0~2 0~2 None


Power Forecast Allowed NO



Power Level 0 0~13 0~13 None

SET GTRXDEV(Optional) TRX

PwrCtrlDLAdjPeriod 3 0~255



SAIC Allowed NO NO(No), YES(Yes) NO, YES None


SdMrCutNum 1 0~5 0~5 None


Sent Freq.of preprocessed MR Once_ps

NOreport(Do not report), Twice_ps(Twice every second), Once_ps(Once every second), Once_2s(Once every two second), Once_4s(Once every four second)

NOreport, Twice_ps, Once_ps, Once_2s, Once_4s None


Switch for BTS Supporting SAIC PC Adjust OFF

OFF(Off), ON(On) OFF, ON None

SET GCELLSOFT(Optional) Cell

TchMrCutNum 3 0~10 0~10 None


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Transfer BTS/MS Power Class YES



Transfer Original MR NO



UL MR. Number Predicted 0 0~3 0~3 None


UL Qual. Bad Trig Threshold 3 0~7 0~7 None


UL Qual. Bad UpLEVDiff 5 0~63 0~63 dB


UL Qual. Lower Threshold 3 0~7 0~7 None


UL Qual. Upper Threshold 0 0~7 0~7 None


UL RX_LEV Lower Threshold 18 0~63 0~63 dB


UL RX_LEV Upper Threshold 30 0~63 0~63 dB


ULAFSRexQualHighThred 14 1~30 1~30 dB


ULAFSRexQualLowThred 14 1~30 1~30 dB


ULAHSRexQualHighThred 16 1~30 1~30 dB


ULAHSRexQualLowThred 16 1~30 1~30 dB




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ULFSRexQualHighThred 16 1~30 1~30 dB


ULFSRexQualLowThred 16 1~30 1~30 dB


ULHSRexQualHighThred 18 1~30 1~30 dB


ULHSRexQualLowThred 18 1~30 1~30 dB


ULMAXDownStep 6 1~30 1~30 dB


ULMAXUpStep 8 1~30 1~30 dB


ULRexLevAdjustFactor 3 0~10 0~10 None


ULRexLevExponentFilterLen 3 0~19



ULRexLevHighThred 18 0~63 0~63 dB


ULRexLevLowThred 18 0~63 0~63 dB


ULRexLevSlideWindow 1 1~20



ULRexQualAdjustFactor 6 0~10 0~10 None


ULRexQualExponentFilterLen 3 0~19



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ULRexQualSlideWindow 1 1~20



BSS Power Control 5 Counters


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5 Counters For the counters, see the BSC6900 GSM Performance Counter Reference.

BSS Power Control 6 Glossary


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6 Glossary For the acronyms, abbreviations, terms, and definitions, see the Glossary.

BSS Power Control 7 Reference Documents


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7 Reference Documents 3GPP TS 04.08: "Mobile radio interface layer 3: specification" 3GPP TS 05.08: "Digital cellular telecommunications system (Phase 2+); Radio subsystem link control"

BSC6900 Feature List BSC6900 Optional Feature Description GBSS Reconfiguration Guide BSC6900 GSM Parameter Reference BSC6900 GSM MML Command Reference BSC6900 GSM Performance Counter Reference

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